ES1073922U - Multilayer canvas (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Multilayer canvas, characterized by encapsulating a reinforcing plastic screen inside the canvas. (Machine-translation by Google Translate, not legally binding)

Description

Multilayer canvas

State of the art

In the world of outdoor advertising, the most widespread support for an advertising message is the printing on a canvas of the necessary measures.

These canvases have always been invariably Calendered PVC reinforced opaque. This specificity is explained by the requirements to be met by the support canvas, those cited requirements are:

- A good opacity.

- Weather resistance.

- Adequate mechanical resistance.

- Dye absorption capacity.

Opacity is the first requirement, since generally the canvases are printed on two sides to allow their viewed from two opposite directions. Regardless of the number of printed faces, it is very important that the printed message is not confuse with transparencies or shadows that a translucent canvas I could allow.

Outdoor placement requires a good weather resistance since campaigns usually have a long duration, from several days to months even. The weather conditions such as direct sun or frost materials deteriorate rapidly.

Another effect of the inclement weather it is the possibility of breaking the banners exposed to a wind strong or gusty When installed, generally, in wide avenues that allow a large influx of potential public, these canvases They suffer especially the effects of the wind.

The need for the image to be clear and well exposed is paramount, this has specialized the system of printing making on other materials the machinery and the Inks are ineffective.

For these reasons, in the world of advertising external innovations in materials are not registered, since the industry has specialized in the first material that offered the necessary results.

Regardless of the quality of the material, the current system presents a series of drawbacks that cause A change of mindset is necessary.

The main drawback is the same use of PVC in the manufacture of banners, first because it is a active pollutant (PVC contains chlorine, one of the most reagents), as it releases dioxins to the environment during decomposition.

Second, the mechanical resistance necessary for a long duration of the campaign, demands more benefits that PVC can give by itself, as a solution a textile fabric of two types of PVC is sandwiched between polyester, material incompatible with PVC that makes it impossible to recycling or return to the production chain.

It is interesting to comment that during the manufacture of banners or canvases of any format seams are made in it, for this sewing a thread of cotton or polyester, which makes recycling even more difficult. While This effect is rectifiable using a PVC thread, the fact that the banner itself is not recyclable does not even raise the change of thread in the garment.

Lastly, we have the price problem, since PVC is a relatively expensive material, of the order of a 50-60% more than polyethylene, the technical polymer simpler.

Description of the invention

In order to get a canvas that meets all the requirements demanded by an outdoor advertising campaign, we have developed the laminated canvas in a single thermoplastic material that we describe below, which we will refer to from now on unique way as multilayer canvas.

It has initially been developed for employment with polyethylene material, as an example in the simplest case, although the procedure is applicable and feasible for any type of polymerizable plastic material.

The manufacturing method used to obtain This multilayer canvas consists of three simple steps:

First step, tissue preparation: Be part of a sufficiently thick and opaque plastic framework, this framework it gives the sheet an adequate resistance, since the existence of fibers in different directions reinforce it against breakage.

Second step, laminate: Over the framework plastic successive plastic layers of the same material are placed, or one chemically compatible, depending on the needs will adhere one or more layers of material, to one or both sides.

The different layers that have to be superimposed, they are welded between them and the fabric by pressure and heat, with a calender specifically designed for this purpose.

Third step, primer: Finally applied on the external surfaces an external treatment that allows Proper absorption any type of standard ink.

An example of manufacturing would be that of prototype samples that we have been manufacturing to check the mechanical requirements

In principle it starts from a flat mesh of polyethylene, usually dark in color and completely opaque to the sunlight.

This mesh, in the form of a continuous coil, is introduces into a machine that performs the plasticizing process through which we can create the outer surfaces, in this case made in polyethylene.

Depending on the requirements, this process is repeat one or more times, to give the canvas a greater thickness, until adjust to the desired weight.

Finally, and not limitatively, it texture the external faces of the material at the end of the machine or the standard primer for the material used applies.

Depending on the applications, this example is it follows in general lines, varying the thickness of the inner mesh or the sheets, according to physical requirements or eliminating the texturing process and / or replacing one treatment with another.

Of the immense number of applications of this multilayer canvas, it follows that depending on the order the specific specifications will fluctuate to a greater or lesser extent, not affected to the general embodiment described above.

Description of the drawings

Figure 1 shows an exploded view of the canvas multilayer, on which we have repeated the step of adding material to adapt the thickness. In this drawing we can appreciate the warp (11) that reinforces the whole and the different layers calendars (12) that give the thickness to the canvas. The outer layer (13) It is the only one that receives the treatment for the absorption of inks

Preferred embodiment

We will define one of the possible methods of manufacture of the monomaterial canvas described in this model useful.

First we manufacture the inner weft. By using a textile machine, we create a thick network of flat belts of the material to be used, in this case polyethylene of low density, which to ensure opacity we define as color black. The machine in its own configurations performs the screening of the fine grain that we need, let's give as an example 0.5 tapes mm wide and 0.2 mm thick without empty spaces between the frame and The warp.

Secondly we perform the plasticizing of the faces, as a non-limiting example we will add successive layers of the same material, in this case low density polyethylene, up to get the right thickness for the application that is going to give it to the material, as an example we will extend the thickness to 0.5 mm gauge. This process can be done in different ways, depending on the used machinery, although as a non-limiting example we use a standard hot calendering machine.

Finally we can incorporate a last layer plastic, to which we have already applied a chemical primer Standard for the absorption of printing inks, this last layer It is applied on both sides of the material, to allow printing by the face and the back interchangeably. Again we can incorporate it in different ways, although continuing with the previous non-limiting example, we assume that it is incorporated by A hot calendering.

Claims (3)

1. Multilayer canvas, characterized by encapsulating inside the canvas a reinforced plastic weave. 2. Multilayer canvas according to claim one characterized by adjusting its thickness by incorporating successive layers. 3. Multilayer canvas according to previous claims characterized by admitting different treatments to optimize the adhesion of the inks.